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(No Model.)

J. H. BLEOO.

BURG-LAR ALARM.

Patented Apr. 29,1890.

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@y gv ATTORNEYS UNITED STATES PATENT OFFICE.

JOHN Il. BLEOO, OF BROOKLYN, ASSIGNOR TO THE MUTUAL DISTRICT TELEGRAPI-I COMPANY, OF NF\V YORK, N. Y.

BURG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 426,706, dated April 29, 1890.

Application tiled August 5, 1889. Serial No. 319,731. (No model.)

T0 @ZZ whom it Hwy concern:

Be it known that I, JOHN II. BLEOO, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Burglar-Alarm Spring, of which the following is a full, clear, and exact description.

This invention relates to burglaralarm springs, the object of the invention being to provide a spring which may bc set from the inside of the door or window, thus permitting the outward passage of the operator, but sounding an alarm should the door or window be opened subsequentto the setting of the alarm.

To the ends above named the invention consists in the construction and arrangement of parts hereinafter described and claimed.

Reference is to be had to the accompanying drawings, termin g a part of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a face View of a door, representing the same as it appears when provided with my improved burglar-alarm spring, the spring proper and its connections in this and in all oi the views being represented upon an exaggerated scale for the purpose of clearness. Fig. E2 is a view on line a; a: of Fig. l. Fig. 3 is a View ot' a portion of the door j amb or frame, the spring and its connection being represented as they appear when adjusted to place prior to the closing of the door; and Fig. 4: is a view of the parts as they appear when the door has been opened and the spring moved to a position to open the circuit and sound an alarm.

In the drawings, 10 represents a spring that is arranged for rigid connection at one end with a door or window. This connection may be brought about in any desired manner; but in practice I prefer to establish connection by means ot screws or tacks ll, that are passed through apertures formed in the lower end of the spring. Above that section of the spring which is arranged for rigid connection with the door or window frame the spring is carried outward, so that it will normally rest as represented in Fie'. 4.

In connection with the spring l0, I employ a plate or arm l2, which is pivotally connected to the frame by a screw or n'ail 13. This plate l2 is provided with a catch llt, adapted to engage the upper end ot the spring l0. Iiinewires 20 are led to the spring and plate, as represented in the drawings.

In setting the spring the plate or arm l) is carried downward to the position shown in 'full lines in Fig. 3 and indicated by dotted lines in Fig. 2, the tree end ot' the spring being at this time held inward, so that it will be engaged by the catch. After the parts have been adjusted as just described they will appear as represented in Fig. 3. Then when the door or window is swung inward the spring l0 will be compressed so as to appear as represented in Fig. l, and this compressing oi the spring will carry the plate or arm l2 to the position in which it is shown in full lines in Fig. 2--that is, to a position such that when t-he door or window is opened and the pressure upon the spring relaxed the spring in resuming its normal position will free itself from the catch lt and the circuit will be broken.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A burglar-alarm comprising a springterminal bowed or inclined from lits attaching-point toward its free end and a catch constituting an opposing terminal, under which the free end of the spring may beheld and movable in the direction ot the length ot the spring, the tendency ot' the free end of the spring being to spring away from the catch to break an alarm-circuit, whereby the two parts of said alarm may be locked together between the meeting edges of a door and its frame, for instance, and set for action by closing the said door to iiatten the spring and cause it to push the catch, as and fort-hc purpose described.

2. A burglar-alarm comprising a springterminal bowed or inclined from its attaching-point toward its free end and a swinging plate constituting an opposing terminal having a catch, under which the tree end of the spring may be lield, the tendency Of the end of the spring to free itself from the plate spring being t0 spring away from said plate, and eateli t0 break an alarm-Circuit when whereby when the spring is engaged with said dooris opened,snbstantlallyas set forth. xo

Said eal'eli and then compressed by a door, JOHN H. BLEOO. 5 for instance, it. will flatten, press against the XVitnesSeS:

eateli, and move Jthe swinging plate, thereby EDWARD KENT, J 1'.,

setting The alai'in and permitting said free C. SEDGWICK. 

